To improve the accuracy of load estimating calculation by estimating a necessary cooled/heated water flow rate based on the relationship between a combustion amount and a cooled/heated water temperature without installing a sensor for measuring the flow rate.
A number switching control device is composed of individual control devices 31, 32, 33 for controlling respective absorption chiller/heaters and a number control device 35 for outputting start/stop commands to the individual control devices. The number control device determines the number of operating absorption chiller/heaters suitable for a load condition based on cooled/heated water inlet/outlet temperatures and combustion ratios transmitted from the individual control devices, and transmits the start/stop commands to the individual control devices. The individual control devices determine fuel input amounts so that the cooled/heated water outlet temperatures of the absorption chiller/heaters become temperatures set beforehand, and carries out the inputting/blocking of fuel to the absorption chiller/heaters according to the start/stop commands from the number control device.
COPYRIGHT: (C)2011,JPO&INPIT
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